esp8266.ino

/**
 * Example that connects an ESP8266 based board to the Losant
 * IoT platform. This example reports state to Losant whenever a button is
 * pressed. It also listens for the "toggle" command to turn the LED on and off.
 *
 * This example assumes the following connections:
 * Button connected to pin 14.
 * LED connected to pin 12.
 *
 * Copyright (c) 2023 Losant. All rights reserved.
 * http://losant.com
 */

#include <ESP8266WiFi.h>
#include <WiFiClientSecure.h>
#include <time.h>
#include <Losant.h>

// WiFi credentials.
const char* WIFI_SSID = "my-wifi-ssid";
const char* WIFI_PASS = "my-wifi-pass";

// Losant credentials.
const char* LOSANT_DEVICE_ID = "my-device-id";
const char* LOSANT_ACCESS_KEY = "my-app-key";
const char* LOSANT_ACCESS_SECRET = "my-app-secret";

const int BUTTON_PIN = 14;
const int LED_PIN = 12;

bool ledState = false;

// Cert taken from 
// https://github.com/Losant/losant-mqtt-ruby/blob/master/lib/losant_mqtt/RootCA.crt
static const char digicert[] PROGMEM = R"EOF(
-----BEGIN CERTIFICATE-----
MIIDrzCCApegAwIBAgIQCDvgVpBCRrGhdWrJWZHHSjANBgkqhkiG9w0BAQUFADBh
MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3
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9w0BAQEFAAOCAQ8AMIIBCgKCAQEA4jvhEXLeqKTTo1eqUKKPC3eQyaKl7hLOllsB
CSDMAZOnTjC3U/dDxGkAV53ijSLdhwZAAIEJzs4bg7/fzTtxRuLWZscFs3YnFo97
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T19sdl6gSzeRntwi5m3OFBqOasv+zbMUZBfHWymeMr/y7vrTC0LUq7dBMtoM1O/4
gdW7jVg/tRvoSSiicNoxBN33shbyTApOB6jtSj1etX+jkMOvJwIDAQABo2MwYTAO
BgNVHQ8BAf8EBAMCAYYwDwYDVR0TAQH/BAUwAwEB/zAdBgNVHQ4EFgQUA95QNVbR
TLtm8KPiGxvDl7I90VUwHwYDVR0jBBgwFoAUA95QNVbRTLtm8KPiGxvDl7I90VUw
DQYJKoZIhvcNAQEFBQADggEBAMucN6pIExIK+t1EnE9SsPTfrgT1eXkIoyQY/Esr
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PnlUkiaY4IBIqDfv8NZ5YBberOgOzW6sRBc4L0na4UU+Krk2U886UAb3LujEV0ls
YSEY1QSteDwsOoBrp+uvFRTp2InBuThs4pFsiv9kuXclVzDAGySj4dzp30d8tbQk
CAUw7C29C79Fv1C5qfPrmAESrciIxpg0X40KPMbp1ZWVbd4=
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
MIIDjjCCAnagAwIBAgIQAzrx5qcRqaC7KGSxHQn65TANBgkqhkiG9w0BAQsFADBh
MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3
d3cuZGlnaWNlcnQuY29tMSAwHgYDVQQDExdEaWdpQ2VydCBHbG9iYWwgUm9vdCBH
MjAeFw0xMzA4MDExMjAwMDBaFw0zODAxMTUxMjAwMDBaMGExCzAJBgNVBAYTAlVT
MRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5j
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NeF22d+mQrvHRAiGfzZ0JFrabA0UWTW98kndth/Jsw1HKj2ZL7tcu7XUIOGZX1NG
Fdtom/DzMNU+MeKNhJ7jitralj41E6Vf8PlwUHBHQRFXGU7Aj64GxJUTFy8bJZ91
8rGOmaFvE7FBcf6IKshPECBV1/MUReXgRPTqh5Uykw7+U0b6LJ3/iyK5S9kJRaTe
pLiaWN0bfVKfjllDiIGknibVb63dDcY3fe0Dkhvld1927jyNxF1WW6LZZm6zNTfl
MrY=
-----END CERTIFICATE-----
)EOF";

BearSSL::WiFiClientSecure wifiClient;

LosantDevice device(LOSANT_DEVICE_ID);

// Set time via NTP, as required for x.509 validation
void setClock() {
  configTime(3 * 3600, 0, "pool.ntp.org", "time.nist.gov");

  time_t now = time(nullptr);
  while (now < 8 * 3600 * 2) {
    delay(500);
    now = time(nullptr);
  }
  struct tm timeinfo;
  gmtime_r(&now, &timeinfo);
}

void toggle() {
  Serial.println("Toggling LED.");
  ledState = !ledState;
  digitalWrite(LED_PIN, ledState ? HIGH : LOW);
}

// Called whenever the device receives a command from the Losant platform.
void handleCommand(LosantCommand *command) {
  Serial.print("Command received: ");
  Serial.println(command->name);
  // Optional command payload. May not be present on all commands.
  //JsonObject payload = *command->payload;
  
  // Perform action specific to the command received.
  if(strcmp(command->name, "toggle") == 0) {
    toggle();
    /**
    * In Losant, including a payload along with your
    * command is optional. This is an example of how
    * to parse a JSON payload from Losant and print
    * the value of a key called "temperature".
    */
    // int temperature = payload["temperature"];
    // Serial.println(temperature);
  }
}

void connect() {

  // Connect to Wifi.
  Serial.println();
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(WIFI_SSID);

  WiFi.begin(WIFI_SSID, WIFI_PASS);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  // Validating  the SSL for for a secure connection you must
  // set trust anchor, as well as set the time.
  BearSSL::X509List cert(digicert);
  wifiClient.setTrustAnchors(&cert);
  setClock();
  

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());

  // Connect to Losant.
  Serial.println();
  Serial.print("Connecting to Losant...");

  device.connectSecure(wifiClient, LOSANT_ACCESS_KEY, LOSANT_ACCESS_SECRET);

  while(!device.connected()) {
    delay(500);
    Serial.print(".");
  }

  Serial.println("Connected!");
}

void setup() {
  Serial.begin(115200);
  while(!Serial) { }
  pinMode(BUTTON_PIN, INPUT);
  pinMode(LED_PIN, OUTPUT);

  // Register the command handler to be called when a command is received
  // from the Losant platform.
  device.onCommand(&handleCommand);

  connect();
}

void buttonPressed() {
  Serial.println("Button Pressed!");

  // Losant uses a JSON protocol. Construct the simple state object.
  // { "button" : true }
  StaticJsonDocument<200> jsonBuffer;
  JsonObject root = jsonBuffer.to<JsonObject>();
  root["button"] = true;

  // Send the state to Losant.
  device.sendState(root);
}

int buttonState = 0;

void loop() {

  bool toReconnect = false;

  if(WiFi.status() != WL_CONNECTED) {
    Serial.println("Disconnected from WiFi");
    toReconnect = true;
  }

  if(!device.connected()) {
    Serial.println("Disconnected from Losant");
    toReconnect = true;
  }

  if(toReconnect) {
    connect();
  }

  device.loop();

  int currentRead = digitalRead(BUTTON_PIN);

  if(currentRead != buttonState) {
    buttonState = currentRead;
    if(buttonState) {
      buttonPressed();
    }
  }

  delay(100);
}